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You might try a different USB port, if available. Some ports are "current-limited" and don't put out enough juice for charging. Finding one on your computer is pretty much hit-or-miss, because most computer manufacturers don't disclose which is what in their documentation.
I have had good results with an aftermarket charge/data cable on my RAZR V3 by plugging it into a Compaq laptop and leaving the computer plugged in and in Standby mode (I just close the cover, which blanks the screen). It's a great feature when traveling, because it eliminates the bulk and weight of Yet Another Charger. |
Originally Posted by mlepore
(Post 5537068)
This has to be one of the most irritating and stupid design decisions - especially coupled with the fact that its really easy to not notice when the RAZR battery goes dead.
I have (twice now) had the RAZR die, and not have enough juice left to power up. Since it couldn't power up (fully) to "register" with the laptop, it wouldn't charge. I know that its not a USB problem, because you can charge non USB phones off the USB port without them registering as a data link... its something special with the RAZR. The device has to be powered to ask for more than 100mA. If a device tries to use too much power without asking, the PC can tell it to shut off. Any idiot circuit designer should be able to power the USB logic using the 100mA default power allocation (I've done it). Perhaps the RAZR's chipset is such that the chip that does the USB communications requires more than 100mA so that it cannot initially ask for more power, thus not working at all. (Just a guess). |
Originally Posted by CessnaJock
(Post 8888458)
You might try a different USB port, if available. Some ports are "current-limited" and don't put out enough juice for charging. Finding one on your computer is pretty much hit-or-miss, because most computer manufacturers don't disclose which is what in their documentation.
For each hub listed you can see the power use. Right click on the Hub, then click Properties. Go to the Power tab and you can see a list of devices and the power they've been allocated, as well as the maximum that can be allocated. Note that you'll see more hubs than you can find on the outside of your PC. My notebook has two USB ports, both on the same hub, but it has 5 listed USB hubs (internal devices, etc.). This is for XP. Win 2000 is similar. Dunno about Vista. |
I'm sitting at EWR waiting for a flight and decided to try hooking up my old V3c that would not charge from any other computer. But it is working with my new ASUS eeePC
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Originally Posted by ralfp
(Post 8888668)
For each hub listed you can see the power use. Right click on the Hub, then click Properties. Go to the Power tab and you can see a list of devices and the power they've been allocated, as well as the maximum that can be allocated.
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On a semi-related note:
Has anyone ever had success charging a SLVR or RAZR with a non-motorola wall charger? I have 2 different mini USB chargers (for headsets and such) but they are not motorola and my SLVR will not charge off of them, I lost my wall charger so the more alternate ways the better. Do I have to remove or connect some pins in the mini USB cable, I don't quite get why another USB wall charger doesn't appear to work. |
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